US4118708A - Telescopic aerial with friction retaining sleeves - Google Patents

Telescopic aerial with friction retaining sleeves Download PDF

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Publication number
US4118708A
US4118708A US05/801,979 US80197977A US4118708A US 4118708 A US4118708 A US 4118708A US 80197977 A US80197977 A US 80197977A US 4118708 A US4118708 A US 4118708A
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US
United States
Prior art keywords
tubular element
tubular
elements
adjacent
aerial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/801,979
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English (en)
Inventor
Giorgio Lozar
Renato Favale
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKEPSY SA
Original Assignee
Indesit Industria Elettrodomestici Italiana SpA
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Publication of US4118708A publication Critical patent/US4118708A/en
Assigned to SOCIETA ITALIANA PER LO SVILUPPO DELL'ELETTRONICA S.I.SV.EL. S.P.A. reassignment SOCIETA ITALIANA PER LO SVILUPPO DELL'ELETTRONICA S.I.SV.EL. S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INDESIT INDUSTRIA ELETTRODOMESTICI, ITALIANA S.P.A.
Assigned to SKEPSY S.A. reassignment SKEPSY S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EDICO S.R.L., S.I.SV.EL. S.P.A.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H01Q1/10—Telescopic elements

Definitions

  • the present invention relates to a telescopic aerial and particularly to such an aerial which is suitable for a portable radio or television receiver.
  • Telescopic aerials for portable television or radio receivers are usually formed by a series of chromium plated brass tubes, having a wall thickness in the region of, for example, 0.25mm and of successively smaller diameters ranging from, for example, 6 millimeters down to 2 millimeters.
  • the tubes must be sufficiently free to slide into one another when caused to do so by a force applied manually, but must engage with one another frictionally sufficient to prevent them from slipping in either direction.
  • the frictional engagement is usually achieved by means of springs made of hard brass or phosphor bronze, of a thickness in the region of 0.1mm, and shaped in the form of cylindrical sections, with deep dimples which engage in holes provided adjacent the ends of the tubes.
  • springs apart from not being easy to manufacture, require very careful and critical manual installation when the aerial is being assembled. Above all, the centering of the dimple of the spring in relation to the hole adjacent the end of the tube is very difficult for the operator and makes it practically impossible to assemble the tubes in an automatic machine.
  • French Pat. No. 1,404,618 discloses and describes a telescopic aerial comprising a central cylindrical stem having a number of cylindrical tubular elements of successively greater diameters coaxially mounted thereon. Between the central stem and the adjacent coaxial tubular element is located a longitudinally split spring sleeve acting as a friction element which is fixed to the base of the central stem.
  • a similar longitudinally split spring sleeve is interposed between each tubular element and the adjacent tubular element which surrounds it, the sleeve being connected to the inner of the two tubular elements between which it is positioned by means of a fastening in such a manner that the split sleeve moves with the tubular element which it surrounds; each tubular element is provided at its upper, outer end with an inwardly directed lip forming an abutment stop against which the split spring sleeve of the adjacent tubular element within it abuts when it has been drawn out telescopically to its greatest extent.
  • the technical problem which the present invention seeks to solve is to provide a telescopic aerial which does not have the above-mentioned disadvantages of prior art aerials, which is formed of simple elements, and which can be assembled entirely by machine.
  • a telescopic aerial comprising a central cylindrical stem, a plurality of cylindrical tubular elements of successively larger diameters coaxially surrounding the stem, such that one end of the central stem and one end of each of the tubular elements is slidably located within the immediately surrounding tubular element with the other end projecting at least partly therefrom, a longitudinally split sleeve carried at or adjacent the said one end of the central stem and located between the central stem and the immediately surrounding tubular element, a plurality of further split sleeves, each interposed between a respective tubular element and the tubular element which surrounds it, each of the split sleeves serving to frictionally engage the two tubular elements between which it is located, each tubular element having at its other end an annular radially inwardly directed lip forming an abutment stop against which engages the split sleeve located between this tubular element and the adjacent element within it when the said adjacent element is extended to its maximum extent, is charcterised in that each tubular element has at its said one end,
  • each tubular element has at least one tap projecting radially inwardly to form an abutment stop against which engages the said one end of the adjacent element within it when the said adjacent element is retracted fully into the said element.
  • aerials formed as embodiments of the present invention are held together so that the elements of which they consist are prevented both from slipping out from one another and from slipping too far into one another.
  • the present invention also comprehends a process for the manufacture of a telescopic aerial comprising a central cylindrical stem, a plurality of cylindrical tubular elements of successively larger diameters coaxially surrounding the stem, a longitudinally split sleeve carried at or adjacent the said one end of the central stem and located between the central stem and the immediately surrounding tubular elements, a plurality of further split sleeves each interposed between a respective tubular element and the tubular element which surrounds it, each of the split sleeves serving to frictionally engage the two tubular elements between which it is located, each tubular element having at its other end an annular radially inwardly directed lip forming an abutment stop against which engages the split sleeve located between this tubular element and the adjacent element within it when the said adjacent element is extended to its maximum extent, in which each tubular element has as its said one end, a part of greater diameter than the main part by an annular shoulder, in which each split sleeve interposed between two tubular elements is freely slidable with respect to each of
  • FIG. 1 is an exploded view illustrating in perspective the elements of which a telescopic aerial constructed according to the present invention is formed;
  • FIG. 2 is a set of axial sections illustrating the successive stages, indicated A, B, C, D, E, F, G, in the assembly of the elements forming a telescopic aerial formed as an embodiment of the invention
  • FIG. 3 is a detail on an enlarged scale, of a part of FIG. 2G.
  • FIGS. 4 and 5 illustrate the elements of FIG. 3 in the two end positions which the elements can adopt.
  • FIG. 1 the basic components of a telescopic aerial formed as an embodiment of the present invention, before being assembled together. These components comprise:
  • a cylindrical sleeve 3 having an axial slit 10, and made of phosphor bronze or solid brass;
  • the tubular elements 4,4' are provided with a section 7,7' of greater diameter at one end which, in normal use, will be their lower end, connected to the main part by a substantially radial annular surface forming a shoulder 13, 13' and each have an annular inwardly projecting lip 6,6' at the other end which in normal use will be the upper end.
  • a section 7,7' of greater diameter at one end which, in normal use, will be their lower end, connected to the main part by a substantially radial annular surface forming a shoulder 13, 13' and each have an annular inwardly projecting lip 6,6' at the other end which in normal use will be the upper end.
  • the tongues 12, 12' are preferably but not necessarily, diametrically opposite one another.
  • a telescopic aerial may consist, for example, of a stem 1 and five tubular elements of successively greater diameter, which are fitted into one another.
  • FIG. 2 illustrates the various stages involved in assembling the individual elements together, and the various operations which are performed on the elements in order to fix them together in such a way that the finished aerial will satisfy the functional requirements.
  • FIG. 2A illustrates the first stage of assembly in which the split spring sleeve 3 is fitted onto the stem 1.
  • FIG. 2B is shown the second stage of assembly in which the split sleeve 3 is punched or pressed by two diametrically opposed tools indicated by the two arrows of FIG. 2 aligned with the groove 2 in the stem 1, so as to create two embossed dimples 8 which project into the groove 2 of the stem 1 in order to prevent the sleeve 3 from sliding with respect to the stem 1.
  • FIG. 2C illustrates the form of the split sleeve 3 after the punching operation.
  • FIG. 2D illustrates the third assembly stage in which the stem 1 carrying the split sleeve 3 is inserted into a first, or innermost, tubular element 4.
  • the stem 1 is prevented from being pushed through the upper end of the tubular element 4 by the split sleeve 3, should the stem 1 be inserted too far because the sleeve 3, being solidly joined to the stem 1 by means of the embossed dimples 8, abuts against the inwardly turned rim 6 of the tubular element 4 when the stem reaches its uppermost position.
  • the next stage in the assembly comprises the insertion of the assembly formed so far into the lower end of a further tubular element 4'. Following this, as shown in FIG. 2G, the two tongues 12' of the tubular element 4' are folded inwardly like the tongues 12 of the tubular element 4, to form radially inwardly projecting tabs 9'.
  • This stage of assembly also includes the fitting of a further split sleeve 5' over the tubular element 4'.
  • the split sleeves 5, 5' etc. serve to frictionally engage between adjacent tubular elements so that when the aerial has been extended it does not slip back under gravity, they also serve to ensure electrical contact between adjacent tubular elements and also, to prevent the tubular elements from being pulled out from one another upon extension of the aerial to its maximum extent. This is achieved by the split sleeve abutting the radially inwardly directed lip 6 at the upper end of the tubular element which surrounds it, and the shoulder formed by the substantially radial surface 13 separating the main portion of the tubular element from the enlarged section at the lower end thereof.
  • the tabs 9,9' as mentioned above, prevent the tubular elements from being pushed out through the lower end of the immediately surrounding tubular element when the aerial is being collapsed.
  • the enlarged portion 7 of a tubular element 4 by contacting the tab 9' of the enlarged section 7' of the immediately surrounding tubular element 4' transfers the applied collapsing force thereto so that the element 4' is displaced with the element 4 once the latter has been pushed into its maximum extent.

Landscapes

  • Mutual Connection Of Rods And Tubes (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
US05/801,979 1976-06-09 1977-05-31 Telescopic aerial with friction retaining sleeves Expired - Lifetime US4118708A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT68397/76A IT1063168B (it) 1976-06-09 1976-06-09 Antenna telescopica per un ricevitore di segnali
IT68397A/76 1976-06-09

Publications (1)

Publication Number Publication Date
US4118708A true US4118708A (en) 1978-10-03

Family

ID=11309258

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/801,979 Expired - Lifetime US4118708A (en) 1976-06-09 1977-05-31 Telescopic aerial with friction retaining sleeves

Country Status (7)

Country Link
US (1) US4118708A (de)
BE (1) BE855540A (de)
DE (1) DE2724983A1 (de)
FR (1) FR2354644A1 (de)
GB (1) GB1520207A (de)
IT (1) IT1063168B (de)
NL (1) NL7706088A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4647934A (en) * 1984-03-26 1987-03-03 Harada Kogyo Kabushiki Kaisha Multistage extensible rod antenna
CN104538723A (zh) * 2015-02-04 2015-04-22 上海航天测控通信研究所 一种车载雷达用的垂直升降装置
US9806396B2 (en) * 2012-09-28 2017-10-31 Huawei Device Co., Ltd. Antenna, combination antenna, and mobile terminal
RU2717122C1 (ru) * 2019-06-06 2020-03-18 Открытое акционерное общество "Межгосударственная Корпорация Развития" (ОАО "Межгосударственная Корпорация Развития") Телескопическая мачта
USD910484S1 (en) * 2018-10-05 2021-02-16 Ari Samuel Perlin Decoration
USD990368S1 (en) 2018-10-05 2023-06-27 Ari Samuel Perlin Decoration assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0063783B1 (de) * 1981-04-28 1985-08-14 DORNIER SYSTEM GmbH Teleskopartig längenveränderliche Einrichtung
US4364140A (en) * 1981-05-12 1982-12-21 Lawrence Irwin F Pipe cleanout tool
JP2000004112A (ja) * 1998-06-15 2000-01-07 Matsushita Electric Ind Co Ltd アンテナ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2391202A (en) * 1943-05-15 1945-12-18 Zenith Radio Corp Telescopic rod antenna
US2677973A (en) * 1950-07-20 1954-05-11 Pioneer Specialty Company Retractable aerial

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2344425A (en) * 1942-08-26 1944-03-14 Snyder Mfg Company Radio antenna
FR1285940A (fr) * 1961-01-14 1962-03-02 Tubes télescopiques applicables notamment à des antennes et leur procédé de fabrication
FR1404618A (fr) * 1964-05-22 1965-07-02 Perfectionnement apporté aux montages de tubes télescopiques et notamment aux antennes extensibles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2391202A (en) * 1943-05-15 1945-12-18 Zenith Radio Corp Telescopic rod antenna
US2677973A (en) * 1950-07-20 1954-05-11 Pioneer Specialty Company Retractable aerial

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4647934A (en) * 1984-03-26 1987-03-03 Harada Kogyo Kabushiki Kaisha Multistage extensible rod antenna
US9806396B2 (en) * 2012-09-28 2017-10-31 Huawei Device Co., Ltd. Antenna, combination antenna, and mobile terminal
CN104538723A (zh) * 2015-02-04 2015-04-22 上海航天测控通信研究所 一种车载雷达用的垂直升降装置
CN104538723B (zh) * 2015-02-04 2018-10-12 上海航天测控通信研究所 一种车载雷达用的垂直升降装置
USD910484S1 (en) * 2018-10-05 2021-02-16 Ari Samuel Perlin Decoration
USD990368S1 (en) 2018-10-05 2023-06-27 Ari Samuel Perlin Decoration assembly
RU2717122C1 (ru) * 2019-06-06 2020-03-18 Открытое акционерное общество "Межгосударственная Корпорация Развития" (ОАО "Межгосударственная Корпорация Развития") Телескопическая мачта

Also Published As

Publication number Publication date
BE855540A (fr) 1977-10-03
IT1063168B (it) 1985-02-11
NL7706088A (nl) 1977-12-13
FR2354644B1 (de) 1981-11-13
FR2354644A1 (fr) 1978-01-06
DE2724983A1 (de) 1977-12-22
GB1520207A (en) 1978-08-02

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AS Assignment

Owner name: SOCIETA ITALIANA PER LO SVILUPPO DELL ELETTRONICA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INDESIT INDUSTRIA ELETTRODOMESTICI, ITALIANA S.P.A.;REEL/FRAME:004614/0685

Effective date: 19860709

AS Assignment

Owner name: SKEPSY S.A., LUXEMBOURG

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:S.I.SV.EL. S.P.A.;EDICO S.R.L.;REEL/FRAME:007185/0877

Effective date: 19940907